java.lang.IllegalArgumentException异常：我们已经有了一个EditText，只能有一个

Question

错误：

07-19 16:39:56.806 29207-29207/ch.android.md E/AndroidRuntime﹕ FATAL EXCEPTION: main 
java.lang.RuntimeException: Unable to start activity ComponentInfo{ch.swissfm.md/ch.swissfm.md.Login}: java.lang.IllegalArgumentException: We already have an EditText, can only have one 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2200) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2262) 
     at android.app.ActivityThread.access$600(ActivityThread.java:148) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241) 
     at android.os.Handler.dispatchMessage(Handler.java:99) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5145) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:511) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:802) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:569) 
     at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132) 
     at dalvik.system.NativeStart.main(Native Method) 
Caused by: java.lang.IllegalArgumentException: We already have an EditText, can only have one 
     at android.support.design.widget.TextInputLayout.setEditText(TextInputLayout.java:150) 
     at android.support.design.widget.TextInputLayout.addView(TextInputLayout.java:139) 
     at ch.swissfm.md.Login.onCreate(Login.java:46) 
     at android.app.Activity.performCreate(Activity.java:5174) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2164) 
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2262) 
     at android.app.ActivityThread.access$600(ActivityThread.java:148) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241) 
     at android.os.Handler.dispatchMessage(Handler.java:99) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5145) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:511) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:802) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:569) 
     at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132) 
     at dalvik.system.NativeStart.main(Native Method) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:802) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:569) 
     at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132) 
     at dalvik.system.NativeStart.main(Native Method) 

Login.java：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    [..] 
    TextInputLayout layout = (TextInputLayout) findViewById(R.id.login_form_layout); 
    33 layout.setErrorEnabled(false); 
    34 layout.setError(getString(R.string.error)); 
    35 
    36 EditText s2_username = new EditText(this); 
    37 EditText s2_pw = new EditText(this); 
    38 EditText s2_ip = new EditText(this); 
    39 EditText s2_port = new EditText(this); 
    40 s2_username.setHint(R.string.s2_username); 
    41 s2_pw.setHint(R.string.s2_pw); 
    42 s2_ip.setHint(R.string.s2_ip); 
    43 s2_port.setHint(R.string.s2_port); 
    44 layout.addView(s2_username, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); 
    45 layout.addView(s2_pw, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); 
    46 layout.addView(s2_ip, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); 
    47 layout.addView(s2_port, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); 
    [..] 
} 

layout_login.xml：

<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/main_content" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="@drawable/background_login"> 

    <android.support.design.widget.TextInputLayout 
     android:id="@+id/login_form_layout" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
    </android.support.design.widget.TextInputLayout> 

    <android.support.design.widget.FloatingActionButton 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom|end" 
     android:layout_margin="16dp" 
     android:src="@drawable/ic_blur" 
     app:layout_anchorGravity="bottom|right|end" /> 

</android.support.design.widget.CoordinatorLayout> 

现在这个错误来自哪里？我发现“我们已经有一个EditText，只能有一个”here，但不知道如何处理它。
提示：如果我使用.xml添加EditTexts，我会得到相同的错误。

这里有一些来源我用：
Implement Text Input Layout Using Android Design Support Library
Design Support Library v22.2.0について Part 1

Answer 1

的TextInputLayout用于处理提示的是如何显示了一个EditText的行为。因此，我认为只能将一个EditText添加到TextInputLayout。

一个简单的解决方案可能是：

添加更多TextInputLayout的对XML和在代码中使用它们，如：

<LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical"> 

    <android.support.design.widget.TextInputLayout 
     android:id="@+id/login_form_layout_username" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
    </android.support.design.widget.TextInputLayout> 

    <android.support.design.widget.TextInputLayout 
     android:id="@+id/login_form_layout_pw" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
    </android.support.design.widget.TextInputLayout> 

    (...) 

</LinearLayout> 

的LinearLayout用于对齐低于前每个项目。

而在你的类：

TextInputLayout layout_username = (TextInputLayout) findViewById(R.id.login_form_layout_username); 
TextInputLayout layout_pw = (TextInputLayout) findViewById(R.id.login_form_layout_pw); 

(...) 

layout_username.addView(s2_username, ...); 
layout_pw.addView(s2_pw, ...);